linux

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Files

Waiman Long 103b08709e cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping

Currently the user can set up isolated cpus via cpuset and nohz_full in
such a way that leaves no housekeeping CPU (i.e. no CPU that is neither
domain isolated nor nohz full). This can be a problem for other
subsystems (e.g. the timer wheel imgration).

Prevent this configuration by blocking any assignation that would cause
the union of domain isolated cpus and nohz_full to covers all CPUs.

[longman: Remove isolated_cpus_should_update() and rewrite the checking
 in update_prstate() and update_parent_effective_cpumask()]

Originally-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Chen Ridong <chenridong@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

2025-11-05 07:00:33 -10:00

cgroup-internal.h

cgroup: replace global percpu_rwsem with per threadgroup resem when writing to cgroup.procs

2025-09-10 07:44:51 -10:00

cgroup-v1.c

cgroup: replace global percpu_rwsem with per threadgroup resem when writing to cgroup.procs

2025-09-10 07:44:51 -10:00

cgroup.c

cgroup: Defer task cgroup unlink until after the task is done switching out

2025-11-03 11:46:18 -10:00

cpuset-internal.h

cgroup/cpuset: Don't track # of local child partitions